Furnace.



" c. R. WAID.

FURNACE.

APPLICATION FILED AUG 21, 1911 Patented Oct. 22, 1912.

a z a 1 J Witnesses UNITED STATES CALVIN R.'WAID, 0F BIRMINGHAM, ALABAMA.

FURNACE.

Specification of Letters Patent. Patented Oct. 22,1912.

Application filed August 21, 1911. Serial No. 45,075.

To all whom it may concern:

Be it known that I, CALVIN R. WAID, a citizen of the United States, residing at Birmingham, in the county of Jefierson and State of Alabama,have invented a new and useful Furnace, of which the following is a specification.

This invention relates to furnaces for stationary boilers and its principal object is to produce practically complete combustion of products leaving the fire box, there being a novel form of bridge wall presenting an extensive surface the temperature of which is maintained at such a degree as to ignite practically all combustible products passing over said surface, the heat being deflected upwardly against the boiler by said surface.

A further object is to provide the smoke chamber with an arch so proportioned as to cause the gaseous products to become thor: oughly, commingled and to be ignited by the hot surface of the arch, prior to'passing into the fines of the boiler.

With the foregoing and other objects in view which will appear as the description proceeds, the invention resides in the combination and'arrangement of parts and in the details of construct-ion hereinafter described and claimed, it being understood that changes in the precise embodiment of the invention herein disclosed can be made within the scope of what is claimed without departing from the spirit of the invention.

In the accompanying drawings the preferred form of the invention has been shown.

In said drawings :Figure l is a'cent ral vertical longitudinal section through a fur- .40 nace embodying the present improvements,

the course of the gaseous products of combustion being indicated by arrows. Fig. 2 is a section on line A-B Fig. 1. Fig. 3 is a section on line C-D Fig. 1.

Referring .to the figures by characters of reference 1 designates the fire box-of the furnace and 2 designates the smoke cham her, said fire box being spaced from the smoke chamber by a bridge wall 3. The upper face of the bridge wall is of considerable length, preferably about half as long as the boiler 4 supported above the bri ge wall although it is to be understood that the parts may be of any other desired -proportions. Said upper. face ofth clined upwardly and rearwardly, that end of the upper face nearest the fire box being located close to the grate. 5 while the back end of the upper face of the bridge wall is located close to the boiler 4.

The top of the smoke chambe is arched, as indicated at 6, thQ' 'S3.l( l 8.101; extendin to a point close to the upper flues 7 in the boiler and the curvature of the arch extending through approximately 160. Thus, as shown in Fig. 1, an inverted pocket is formed above the horizontal plane occupied by the uppermost flues.

It is desired to construct the entire f rnace of masonry, the arch 6 and the bridge wall being formed of fire brick. it will be apparent that the products of combustion, upon leaving the fire box 1, will pass rearwardly along the upper concave face of the perature and serves to ignite most" of the unconsumed products passing thereover. Furthermore this inclined upper face of the bridge wall deflects the heat upwardly against the bottom of the boiler 4t and is thus not only advantageous because of the increased consumption of fuel resulting from the use of the brid e wall, but also because of the fact that the heat. is deflected upwardly against the boiler and thus more quickly converts the water inthe boiler into steam. The products of combustion, upon leaving the bridge wall, pass into the smoke chamber 2 and thence upwardly into the pocket formed below the arch 6. This arch causes the combustion products to be deflected downwardly with a whirling action before passing into 'the lines 7 and, as the products passalong the inner surface of the arch, they are heated to the point of ignition by the hot surface of the arch so that any unconsumed combustible products will here be ignited prior to the passage of the products into the fiues 7. By givin the arch the curvature shown and described, a thorough mixing:of the' combustion products the flues, this being due to the downward" deflection of the gases caused by the down wardly extending portion of the arch near est the boiler 4:. The course of the gaseous products has been indicated by arrows in Fig. 1 so that the advantages of the structure illustrated will be more clearly apparent;

.hridge wall is concaved tmnsverslf ind U) will be apparent by referring to the takes placebefore said products pass inter";

bridge 'wallwhich is heated to a high temdrawings that the inclined upper face ot parts of the boiler located above the bridge Wall.

What is claimed is TherolnbinationWith a fire box and a smoke chamber, of a bridge Wall interposed between thofire'boxand the smoke chamber and having its upper face inclined upwardly to the smoke chamber from the fire box and to a point close to the boiler, the upper face of the bridge will being concaved transversely throughout the length i thereof, and a boiler supported above the lite box and the bridg Wall and having one end portion thereo smoke chamber and abutting against the top of said chamber, the top of'said smoke chamber being arched to form a pocket above the plane of the uppermost fines in the boiler.

In testimony that I claim the foregoing asmy own, I have hereto affixed my signature 1n the presence of two Witnesses.

v CALVIN R. WAID. VVitnes sesF -JOHN D. STRANGE,

W. A. MOORE.

Copies of fchis patent may be obtained for five cents each, by addressing the Gommissioner of Patents, Washington, D. C.

projecting into the 

